@neo4j/graphql
Version:
A GraphQL to Cypher query execution layer for Neo4j and JavaScript GraphQL implementations
68 lines • 2.87 kB
JavaScript
;
/*
* Copyright (c) "Neo4j"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.NodeSelectionPattern = void 0;
const cypher_builder_1 = __importDefault(require("@neo4j/cypher-builder"));
const create_node_from_entity_1 = require("../../../utils/create-node-from-entity");
const QueryASTContext_1 = require("../../QueryASTContext");
const SelectionPattern_1 = require("./SelectionPattern");
/** Generates a pattern to select a node */
class NodeSelectionPattern extends SelectionPattern_1.SelectionPattern {
constructor({ target, alias, useContextTarget = false, }) {
super();
this.target = target;
this.alias = alias;
this.useContextTarget = useContextTarget;
}
apply(context) {
let node;
let matchPattern;
// useContextTarget is used when you have to select a node already matched,
// this could be simplified a lot, it's currently not possible as there is no way to build a Cypher.Node from an existing Cypher.Node.
if (this.useContextTarget) {
if (!context.hasTarget()) {
throw new Error("No target found in the context");
}
node = context.target;
matchPattern = new cypher_builder_1.default.Pattern(node);
}
else {
node = (0, create_node_from_entity_1.createNode)(this.alias);
matchPattern = new cypher_builder_1.default.Pattern(node, {
labels: (0, create_node_from_entity_1.getEntityLabels)(this.target, context.neo4jGraphQLContext),
});
}
return {
pattern: matchPattern,
nestedContext: new QueryASTContext_1.QueryASTContext({
target: node,
neo4jGraphQLContext: context.neo4jGraphQLContext,
returnVariable: context.returnVariable,
env: context.env,
shouldCollect: context.shouldCollect,
}),
};
}
}
exports.NodeSelectionPattern = NodeSelectionPattern;
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